Ive just tried the air duster procedure on my VW11 to remove a splodge of dust that shows on the screen about the size of thumb print. I was a nervous wreck as I did it, and dont want to put myself through it again in a hurry. (In all honesty, getting the thing off and on its ceiling mount was the most hair- raising part). The good news is it still works just as before . so Ive not broken it. The bad news is Ive not shifted the splodge at all. In fact when I first switched it back on, there was a second smaller splodge that appeared briefly but thankfully disappeared after a few seconds. Id be grateful of some tips from anyone whos succeeded with this procedure, and also of some sympathy from anyone else whos tried and failed. My own tip to anyone whos yet to try this for the first time is .. get a new projector that doesnt need cleaning after just 70 hours use!